1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 44cc26be37..7fedb0026a 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -368,6 +368,8 @@ class RegistrationConfig(Config):
         # by the Matrix Identity Service API specification:
         # https://matrix.org/docs/spec/identity_service/latest
         #
+        # If a delegate is specified, the config option public_baseurl must also be filled out.
+        #
         account_threepid_delegates:
             #email: https://example.com     # Delegate email sending to example.org
             #msisdn: http://localhost:8090  # Delegate SMS sending to this local process